Newbie problem: can't find the UI ...

[RoelandPer]

Hi folks, this is my second integration through HACS in my HA. I am still learning - and realize there is still a lot to learn.
Going through the closed issues, it looks I'm apparently not the first one to search for the UI after my installation.
As recommended in earlier posts, I added a line "multimatic:" to my configuration.yaml, cleared the cache, restarted HA ... but still have no clue where I can/should find the UI.
Multimatic got installed as per the log entry:
"2024-01-10 21:01:28.745 WARNING (SyncWorker_1) [homeassistant.loader] We found a custom integration multimatic which has not been tested by Home Assistant. This component might cause stability problems, be sure to disable it if you experience issues with Home Assistant".
Your help and guidance will be much appreciated.
Roeland Perdaens

[VaillantHassIo]

Does it appear at your integration page?
Did you configure it with Username and password?

[RoelandPer]

OMG … this is so embarrassing … lucky me I told you guys, I’m a newbie.

For anyone searching for the UI:
After installing from HACS, you need to go over to
Settings
Devices and Services
next click Add Integration in bottom right corner
search for “multimatic”
Multimatic will now appear in your integrations.
Open Multimatic integration
Add the username and password you use in the Multimatic app
Go over to the Multimatic app on your phone, select Settings (gear icon)
Open Network settings to find the serial number.
Save and done.

[RoelandPer]

Found the UI, problem closed