CSS Class editing

@Nancy OShea don't you think that using a structural element to simply affect a visual aspect may be inappropriate? 

I want to edit a paragraph´s size and shape...

By @Audun352967152tl2

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Short answer:  Use a <blockquote> tag.

See screenshot.

Definition and usage of <blockquote> tags for citations from other sources.

https://www.w3schools.com/tags/tag_blockquote.asp

Post back if you need more help.

CSS crash course time...

.class (CSS Class)
Note the . in front of the name. These are usable within multiple elements across your page:
<style>.purpletext{color:purple;}</style>
<div class="purpletext">This div tag has purple text</div>
<p class="purpletext">This is a purple paragraph<p>

#id (CSS ID)
Note the # in front of the name. These are usable only once per page in your website:
<style>#maintext{color:red;}</style>
<div id="maintext">This is the main red text on each page</div>

p, a, link, div (CSS elements)
Note these are tag names and will affect every tag of type in the entire site, if using an external stylesheet.
<style>p{color:green;}</style>
<p>All p tags through the site will be green text</p>

It sounds like it's not making a class (which you have to type in with the . in front), but selecting the <p> element itself. DW's default method of making new CSS selectors is to use a chain of elements like "body p" or "body div article p" which is enormously unhelpful. 

The CSS Designer is bad. Here's how to use it though: https://helpx.adobe.com/dreamweaver/using/css-designer.html 

Under the Define CSS Selectors heading, in Step 2, bullet 2, it explains that when you want to use a class (a set of styles for repeated use across a page), you need to delete the suggested selector it gives you, and enter a class or id name including the . or #.

Once you have the .class and its properties set, it will be available in the Class dropdown in your Properties Window. Highlight the text again (it was unhighlighted when you deleted the suggested overly-general selector) and choose the class from there.

Being French, I'm not sure I understand quite well your question...

I want to be able to edit HTML and CSS and to be able to access the files, and you can´t do either of those on the online website builders I´ve found.

By @Audun352967152tl2

So if the question is "Can I modify CSS and/or HTML files directly from the code in each appropriate files ?" The answer is yes, of course...

DW can do this, not only by opening the corresponding files (HTML, PHP, CSS...) directly, but also by placing your cursor over the relevant portion of HTML code and pressing Ctrl | Cmd + E, you'll get a quick CSS editor attached (or not) to the element in question.

Well, depending on your approach and the complexity of your HTML/PHP page inclusions, this won't always work as expected, but it is a plus somehow.

In any case, any code editor will always let you edit your code, except if you use proprietary internal code specific to the publisher, in which case you'll lose the internal mechanics linked to these specific lines of code (in the case of DW, DWT templates, automated live previews, SCSS management, etc.)...

This may seem like a stupid noobie question

By @Audun352967152tl2

No questions are stupid, only answers can be stupid.

So, here is my stupid response. Why are you wanting to edit a pargraph's shape and size? Please remember that a desktop screen has a lot more realestate than a mobile screen and that both media are used. A mobile screen probably more so than a desktop.

For me to understand more, please paste the code of the page here. That way I can see what you are doing and the result that you want to achieve.