Can one of you kind people tell me how to create VB forms in Excel 2007?

I haven't done this kind of thing in years, and cannot find my way around Excel as easily as I used to.

Looking to create a simple form for the sales team to work out quantities of materials, based on area/volume and relative density. The calculations are easy, but I have no idea where to start designing a form.

[edit] you used to be able to create a simple grey form and add buttons, text boxes and entry fields and create functions/calculations for different fields. This is what I'm having trouble finding.

Nevermind. The developer tab was hidden, I should be able to muddle through now.

Dead clever that isn't it?