If you want to change your staking reward destination, then followup this instruction. There are 3 options in the list: Stash account (increase the amount at stake), Stash account (do not increase the amount at stake) and Controller account.
1.Click the red-boxed button beside
Stop, then click
Change reward destination
2.Choose either of the account and click
Set reward destination
Stash account (increase the amount at stake):
Continue to nominate the validator after the reward is successfully claimed
Stash account (do not increase the amount at stake)
After the reward is received, the balance of the Stash account will be added
The rewards is distributed to the Controller account
3.Confirm and click
Sign and Submit to complete.