Click the top left corner of any account page to enter account management and select [Watched Accounts] - [Add Account].

Paste the address — Select the network and account name — Import — Complete. Now you can view the real-time assets and transaction history of this address.

Note: Watched address is imported using a public key address and can only be viewed without asset ownership, so both [Send] and [Receive] are shown in gray.

More tutorials:

Use App to create or import hot wallet

How to use hardware wallet on App