This is short guide how to extract WIF private key from bip32 seed phrase.
Let's take this seed phrase for example:
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Step 1:
To extract WIF private keys compatible with web wallet go to this website.
Step 2:
Scroll page down and find your address in the list. Once you found it copy private key.
Step 3:
Go to web wallet go to this, click on Open by key
tab and put your private key into the input.
Step 4:
Voila :)