lnurl is very easy in umbrel, just install lnbits and then lnulrp plugin, it will generate as many lnurl as you want.

Note that lnurl and lightning address is not the same, in this case lnbits also generates lightning address but you will have to have your domain.

Post: before doing anything, find out what is lnbits, in their own website you can try it without installing anything in the "demo" button.

If you have any questions, please let me know.