Try the following:
1. Log in to your Tron link wallet
2. Connect your wallet to the WIP.exchange. Your balance will most likely reflect once your wallet is connected
3. Click "Swap"
4. Follow the rest of the instruction that may pop up from the wallet.
Again, make sure you have TRX in your wallet.
What about those who have received via Trust Wallet? I see that I have received WIP as TRC10 token. Can I swap it directly or need to transfer to Tronlink first? Thanks for the answer in advance.