If you already staked tokens, this document will show you How to Stake more on SubWallet.
Step 1: Open SubWallet and choose the "Staking" tab. Then click on the three-dot icon next to the stake you want to stake more for.
Step 2: Choose "Stake more".
Step 3: Fill in the staking request.
In the above example, we are in "All accounts" mode. If you are already in a single account mode, you would not have to select an account. Your staking request form would be like the following image:
Please note that since this is a "stake more" action for a previously performed staking, you might not choose a different validator. If you want to stake for another validator, you would need to start a new staking action.
An example of a completed stake more request would be the following:
To proceed, click the "Stake" button.
Step 4: Check the information and click "Approve" to confirm.
Step 5: Result is in!
If you click "view transaction", the wallet would show you the latest transaction record in your transaction history which corresponds with the extrinsic hash of this action.