Hardly anyone enjoys the game alone in the long term, so it's all the more important when you have people to play with. Especially at the beginning, because playing a lot against bots can quickly become tiring.
If you are looking for teammates,
then you are definitely in good hands of the TCC (Total War Clan Council) Discord
If you are german-speaking, then you can play with me and my clan “SoulWings”. Join here (Discord).
Back on topic, adding friends can be a bit confusing so here's a little guide:
1. Click on the friends list button
2. Now go to the "Find Friends" window (a bit confusing when you want to add a wanted friend first)
3. Then enter the correct ingame name, press Enter and right-click on the name Note upper and lower case
4. Now go to "Add Friend" to add the friend, who then has to confirm the request!