I cant seem to point my s19k pro with braiins operating software to my solo mining on my apollo unit. it says invalid url.
Is your S19K running on your LAN or is it on an external network vs. your Apollo?
If your S19K is outside the LAN you must setup port forwarding on your router to allow traffic on port 3333 to be directed to the internal IP your Apollo.
If your S19K is inside your LAN then you should be able to use the data that is listed on the solo-mining page of your Apollo GUI.
"SOLO LAN Mining
Point any Bitcoin Miner on your local network to your Solo Pool with the following URL: X.X.X.X:3333 Username: <bitcoin address>"