user form to fill in data into specific cells

Hi,

I have this template for printing info onto round 10mm stickers. The alignment and all has been done. What I hope to do next is to have a user form that can help input data into this template.

The info that will be printed onto the stickers are as follows:
first row - a string of numbers not exceeding 4 characters eg: 1234
second row - a string of numbers not exceeding 10 characters including spaces eg: 001 - 20uL
third row - a string of characters not exceeding 4 characters eg: RSID

All these info to be fitted into 1 cell with font size 5.
Please refer to attached workbook for clearer picture.
User form has been created, I would need help in coding the form to work.