Once you've logged in, click on "Connect" at the top of the page, and:

1. select "Crypto Wallet"
2. you'll see the list of wallets / coins you've connected to finappster, and
3. simply click on the white cross in the red circle, in the top right corner of each, to remove it.

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Once you've removed it, all information relating to it will be deleted from finappster forever.