Wait. Let me clear some things . I'm quite confused

First about sending btc on the trading exchange? You mean depositing right? All wallets supports adding a higher miner fee before sending the actual transaction . Or you mean you've already send the actual transaction and now it's stucked because of low fee that's why you're aksing if its possible to pay an extra fee, If yes post your TXID here and we can talk about the ways that's available for you (viabtc, rbf etc. )