impressive that you have found your way to the alby waitlist. 

fastest way on mac that I know is this:

1. go to npub.cash

2. login (nsec (aka your nostr private key) login would probably be easiest for you but note that copying and pasting your nsec to different places on the internet risks having it leaked/stolen and your account compromised. it’s safer to have your private key in a key manager like alby and then login with nip-07, which you can do with the free version of alby, but this is getting more complicated and you asked for quick so i digress)

3. create a password

4. claim a username (i think this costs 5000 sats, if you want, you could share the QR code as a comment to this post and I will happily pay it)

5. go to the settings of whatever nostr client you are using and copy the username from previous step to the “LN address” field 

Boom. you can now receive zaps 

lmk if you run into any issues

PS i wouldnt keep more than 20,000 sats on this type of wallet personally because it is still a work in progress