First, make sure you can login by metamask / trust wallet. You will see your account info on the top right hand corner.
Second, check your wallet is connected to the correct network.
Third, try calling view function like name / decimals and check the result.
If you would like to send token / make transactions, fill in the corresponding inputs and click sign. Then sign the transaction (and pay the gas) in your wallet. (Please make sure you have enough coin to pay gas (MATIC on Polygon network)) Go to the etherscan (ETH) or polygonscan (Polygon) and paste your TxID to check the result.
REMEMBER: All token amount must be multiply by 10^decimals before putting into input. All token amount return from contract should be divided by 10^decimals.