I am sending to Stellarport, what do I use for a memo/tag

You do not need a memo or a tag when sending to your Stellarport wallet. You just need to send payment to your wallet's public address. Any payment going to your wallet's address will arrive in your wallet.

If you are required to add a memo/tag, you can put something random in there. It doesn't matter, regardless, it will arrive in your wallet.