Each Tapni can be linked just to one profile. You can link as many Tapni products as you want to 1 profile, but you cannot link multiple profiles to 1 product.
If you want to add multiple profiles, you will have to create different accounts with different email addresses and usernames. Once you’ve created all the different accounts you can follow the steps in the article How to activate my tag in order to connect each Tapni tag to the corresponding profile .
Once creating the multiple accounts you will be able to switch easily between them: