There are two ways to speed up a #Bitcoin transaction:

1. For the sender: Replace By Fee (RBF). Broadcast a new transaction that replaces the previous one by paying a higher fee.

2. For the recipient: Child Pays For Parent (CPFP). Broadcast a transaction that spends the output of the unconfirmed (parent) transaction and pays a high fee. Miners that want this “child” transaction’s fee must include the parent for it to be valid.

Neither of these options require using a website. You do it from your supporting wallet software.