It's still not working so I'll step you through exactly what I've done. I'm keen to solve this problem once and for all

1. Entered my IP address in the address form. I've done this twice, once using the "ip" from "getinfo" in the console. I wrote it as [2001:0:9d38:6abd:388b:a0d:c2ba:73c1]:23230
The second time I just used my IP address from google eg 122.108.246.144:23230

2. Entered "dumpprivkey (and my masternode address)" in the console, and copied this privkey into the field.

3. entered "masternode outputs" in the console and entered the long string into the Tx Hash and the other number into the output index. I've got my output index as 0, but in the tutorial photo it's a 1. Does this matter? It shows up as 0 from masternode outputs

4. Clicked update and start. It starts up, a few coins might come through before it stops working, with the message "not in masternode list" appearing for the status. I've also copied the addnode stuff into the .conf file. I just pasted it in the next line in notepad. I'm assuming that's ok?

Thanks for your help!