To applaud the article, you can click the applause button on the right of the page (at the bottom of the page if you are on mobile). This will open the tipping panel for you.
From this panel, you can see your NUA, ICP or ckBTC balances in your wallet and tip with these tokens. After entering how many applause you want to give, you can choose the type of Token you want to use. When you tick the General Policy box and click the Applaud button, tokens will be transferred to the writer's wallet.
You can click the Profile Icon > My Wallet to access your wallet and manage your token balances.