Adding reservation types is done via the system->settings->reservationTypes page:
some reservation types come pre-loaded, like client and mechanic
then you add new ones using the 'add' button, bottom right of the page.
When you find the row you want you can Edit it:
Key fields are:
Name : what is the name of your reservation type?
Description: how you want it to appear on your make Reservation button:
Adding a custom icon
Once you have imported your reservation types you can then customise.
One thing you may want to do is upload a custom icon for your reservation type.
Press on the button marked upload to open the image upload dialog.
Add your image. It should be 40px by 16px (width by height)
if you can't make an image of that size talk to BRM support who should be able to help.