There're many wallets support KAVA staking, you can select one from Kava official website. Install and login one of these wallets, such as Keplr, change the network to "Kava":
click "Stake" to enter the staking section:
Select the validator Wetez
Scroll down the page to find the validator Wetez, click "manage" to process:
Delegate to Wetez
A pop-up window will appear, enter the amount of IRIS you want to delegate and click to delegate KAVA to Wetez:
A Keplr pop-up window will appear asking for approval of the transaction. Click on "approve" to complete the delegation:
View and claim staking reward
After the delegation, you can view your current staking reward and claim for it on the top of the same staking section.