PLEASE NOTE: if you would like to withdraw your mining rewards, please use this article here: How do I withdraw my Mining Rewards?
To withdraw or sell a portfolio or coin, please follow the steps below:
Head to your Wallet tab
Tab Settings (Cog icon in the top right)
Locate Sell Portfolio
Choose the asset you would like to sell
Follow the prompts needed
Once done, your portfolio will be sold and your BTC will be deposited into your Bitcoin (Self Custody) wallet!