Saving excel spreadsheet via userform

i'm trying to save the data inputted from the userform thats been written out to excel.

Aim is to click a save button and from their it will prompt the browse directories etc where they want to save but the name is already preset.

ThisWorkbook.SaveAs "C:\Users\u544835\Documents\HPC Requests.xls"

this doesnt let me choose the location etc via browse I have to use the preset folder and name when I click a button, I want to click a button then the browse comes up to what location and name etc

any help kindly appreciated