Hey guys.
There is a problem with my LN channel on my Blue wallet.
For some reason since I updated the apps, it will no longer allow me to send LN payments of more than 2 Sat.
Every time I try, the following message is generated:
I contacted the devs and they are no help.  
So I would like to withdraw the LN funds back on chain.
For withdraws,  the app redirects me to.this page: https://zigzag.io/?utm_source=integration&utm_medium=bluewallet&utm_campaign=withdrawLink#/

So what is my "BTC refund address or invoice"? Where do I find that?
And what is my "BTC blockchain address"? Where do I find that?

I don't have a lot of funds stuck in that channel. But that's all the BTC I have. And it's not mine. So I really would like to send it back to the guy who loaned me those funds.

Thanx