I've created a UserForm with multiple fields. How do I take those fields and have their values added to specific cells in a worksheet?

This question may be easier to answer if I explain exactly what this sheet is doing. I play D&D and am creating a sheet to help me run the game more efficiently. Currently, I am working on the AC side of things. So, the form I have created is a multi-page form. Page 1 is where I enter all of their base stats for AC, the stats that only change when new equipment is found for the most part. Page 2 is the 'buff' page where I add things like a spell that boosts a certain part of AC for 5 rounds or something like that.

I have already designed the spreadsheet formulas to calculate AC properly, since some of these values stack but most of them do not.

How do I link this form to the sheet? I need it to where when I click the button that brings up the form, it has the information from the sheet listed and ready to edit. I would like to have one button and one form, with a drop down field in that form that will switch from player to player.

Hope this isn't too complicated. Most likely, if I can figure out how to link text fields to certain cells, and then change that link with drop down menus (once I figure out how those work as well), then I can figure the rest out on my own... most likely, anyway. ;-)