I’m not sure that Thunderhub has a channel opening bump fee feature, I’ve searched their documentation but it’s not mentioned as something that has been added recently.
This leaves you with two ways to bump the fee (you don’t really bump it, it’s a CPFP, but LND calls it a fee bump)
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Command line - Bumping fee for lightning channel open - lightningwiki.net
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Ride the Lightning (recommended)
RTL is the lightning node UI that we’re supporting in the Start9 marketplace. It does happen to have a fee bump feature.
If you install and open it, configure it to connect to your LND service, you’ll find your channel open in Pending. Next to the channel there’ll be a little button with some drop down options, one of which will be to bump the fee.
Now, something you’ll need to know.
If you open a 500,000 sat channel with a 1,000,000 sat UTXO, depending on the fee you’ll have a TX with an one output of 500,000 (the channel) and another with some 495,000 (the change) and perhaps a fee of 5000 in my example. The first of those outputs will probably be the fee and will be called output #0, the second will be output #1, the channel open, and the third will be #2 your change.
So back in RTL, when you click on bump fee… it’ll ask you for the change output number (which you should now know). It’ll also ask you for the new fee.
(Since you posted it, I’ll assume you don’t care if the community sees your TX)
Something else you’ll need to know.
With a CPFP you are not setting a new fee on the old TX, as you would with a RBF. Instead you are spending your change in a way that will be profitable for a miner to mine, but in order to pick up the change spend, which comes after the first TX you made that you want to speed up, the miner will need to mine both. This means the fee for the second TX, the change spend, needs to be high enough to cover the NEW transaction and make that profitable, AS WELL AS make up for the shortfall in the first transaction fee.
So the second TX fee should be much much higher than the current recommended fee. Perhaps twice, or a bit more? If you make a mistake again, it starts getting very expensive.
Hope this makes sense!