It is basically a UTXO selector that allows you to choose input for your transaction.
In this case you are going to use the address where you are still expecting to receive your BTC (as it is still pending). So you are going to compose and broadcast new transaction (Child) that will pay for your previous one (Parent).
as a recipient of this new (child) transaction, you can use e.g. address generated in another of your account within Trezor Suite interface.
It is important to set the appropriate fee for the child transaction as the miners should be attracted by the fee used in the child transaction to confirm both transactions (the child transaction can be confirmed only if the parent transaction is confirmed first).