Deleting a connected account/brokerage
Go to Settings (right most tab on the bottom navigation bar)
Click on Connected Accounts
Tap on the account you want to delete
Hit the delete button at the bottom
Deleting an alternative / manual asset
If you want to delete a manually added asset such as a sneaker or a watch you can:
Click on the asset you want to delete
Hit the edit button (pen icon) on the top right
Scroll all the way to the bottom
Hit the delete button and confirm
Here's a demo video walking you through the flow as well: