You should be able to sync up with our clearing firm, Apex Clearing. You can find them in the Mint app by searching for Apex. You must have an account with Apex, which you can create from their website: apexclearing.com. You will need your brokerage account number (Apex ID) to create your account. You can find your Apex ID directly in the app.
To find your brokerage account number:
Select the Menu icon ≡ in the top left (or right corner on the website)
Under the All accounts box you will see your account number
Once you have created your account on Apex, you can use your login credentials for Apex on the Mint app.
Just to let you know: you will not be able to view any crypto, treasuries, or alternative assets on Mint, as Apex does not handle these assets.
For further assistance please contact Member Support via in-app chat or email at support@public.com.