Kukai can be run in the browser at kukai.app or as a standalone app.

So, if you want delegate your XTZ using Kukai wallet you need do several steps.

Step 1

Create a new account (or log into your wallet) at kukai.app. To create a KT account, there should be funds on the main account, since a commission of 0.257 XTZ is charged for payment.

Press “New account” button to create a new KT account (only KT accounts can be used for delegation).