how do i add selections from my wishlist to my computer. that is how do i purchase them

Hello there, Pammie49.

It sounds like you're wanting to access and make purchases from your Wishlist in iTunes for Windows. The following Knowledge Base article offers up great information on how to do both:

Use Wish List and Preview History in the iTunes Store - Apple Support

Access your Wish List, Preview History, iTunes Radio History, and history of songs identified by Siri

Mac and PC

1. Open iTunes and go the iTunes Store.
2. Sign in with your Apple ID, if you aren't signed in already.
3. Click on your account name.
4. Select Wish List.
   

You can also see your Wish List in the iTunes Store under Quick Links.

Buy items from your Wish List, Preview History, iTunes Radio History, and history of songs identified by Siri

Mac and PC

1. Open iTunes and go to the iTunes Store.
2. Sign in with your Apple ID, if you aren't signed in already.
3. Click on your account name.
4. Select Wish List.
5. Click the desired content type within Wish List.
   
6. Click the price under the item you want to buy.
7. Type your Apple ID password, if prompted.
8. Click Buy.

Thanks for reaching out to Apple Support Communities.

Cheers.