I need help finding features in new Acrobat, please

I have a paid version of Adobe Acrobat and I am having trouble finding features that I used to use. Can anyone help? I'm a freelance writer under a time crunch and this update is seriously messing me up!

I'm not a creative and I don't do anything fancy - I mostly use Adobe Acrobat to mark up PDF documents for referencing purposes. I'm not loving the new interface, but my main problem is that I cannot find many of the features I rely on.

Previously, I would use the Comments menu to access a tool that lets me insert a letter with a box around it (picture for example an uppercase A with a box around it).  I can't find that tool anymore. I did find a tool that lets me type in text letters, but there is no box, and I also can't figure out how to change the color of the font (ideally I need it to be red).

ALTERNATIVELY, is there a way to switch back to the older version so that I can complete my deadlines without having to spend valuable time hunting for the features/tools I use most?

Thanks in advance for your help,

Dianne