Cannot Find "Prepare Form" Option

I have signed up for a free trial of Adobe Acrobat Pro.

I am trying to turn my PDFs into a fillable form that anyone with access can download and simply fill in text fields with their answers.

However, it seems that there is no option under "tools" to prepare a form. I've looked up multiple tutorials, and all of them tell me to look under tools, then choose "Prepare Form". Yet that option or nothing similar even appears.

The closest thing I have to creating a form is a web form, which is not what I want. 

Is anyone aware on how to find this option or if there is a new way to add fillable text to your PDF for others to fill out?