UserForm Data Entry/VBA

I've created a userform that will pop up automatically when opening my workbook. My workbook will have many worksheets identified by the employee's last name, then first name (i.e. Doe, John) Etc. I ideally would like the name entry in my user form to locate the correct worksheet based on the sheet name and then all of the other data in the user form be put in the next available/appropriate row and column, etc. of that particular sheet. This user form would save me a ton of time keeping my training logs up to date, instead of having to locate each employee tab manually and then enter the data and then look for the next tab, etc.

At the end of the year I'll manually go to each worksheet and balance that year's training time and cost (as you'll see from the attached example), but I'm hoping that the user form entry will identify that "yearly balance row" as having data and would skip to the next row to begin the next year's training entry. The "Enter Data" Button would place all of the user form data (other than the name) into the appropriate row/column and I believe my refresh button will empty the user form fields, but I'm hoping it won't delete the data that was just previously entered into the worksheet. (See attachment)