Yeah go ahead!
Make sure you read the article to understand how it works. https://bitcoinelectrum.com/how-to-do-a-manual-child-pays-for-parent-transaction/

Do not open up your private key in online unless you are very sure about what you are doing.

Good luck.

By the way, if this is not something very urgent to confirm then I suggest you to wait. Sooner or later your tx will be confirmed. Feel free to read this topic: Stop paying crazy tx fees(!) I paid only 1.9sat/B when pool asked me for 100+

And, I almost forgot to welcome you to this forum. Welcome to the community. I hope to see you around.

Cheers :-)

Are you using mobile version?
In that case I have no idea if mobile version gives this option.

There is another thing you can do which is the Child Pays For Parent transaction. Read this: https://bitcoinelectrum.com/how-to-do-a-manual-child-pays-for-parent-transaction/

1. Right click on the tx then click on Increase fee


2. Adjust the amount of fee you want to pay.


fees = byte size * sat/B


This will help: https://www.coinb.in/#fees