User Form Data Posting to a single cell

Hey all,
Thanks in advance for the help in advance. It really will help a lot and save me a lot of time and headaches.

I am trying to create a user form that will produce a checklist. The goal of this checklist is to let the user decide what criteria he wants included in a table. The selection should produce a sequence of numbers and letter (eg: l1vej1j4ryn) which is part of a URL.
So I was wondering how to do this. For example, when the user selects "Name" on the checklist, it will add the letter "n" to the particular cell.
If he/she chooses 'Name," "Earnings/Share," and "Last Trade (Price Only)" the cell should read "nl1e"

I will be inputting the series of letter/numbers in that correspond to the criterion. I just don't know how to create a user form that will post all of this to one particular cell.

Once again thank you for the help. If this is confusing, I will be glad to clarify what it is that I meant.

The attached spreadsheet downloads data from Yahoo Finance. I want to create a user form for the Yahoo Tags.
Each Yahoo tag creates a different column in the table, and all of the tags are in the cell C2. I hope that the user form will add the corresponding tag to cell C2.

Thank you again for all of your help.