Putting this here for Feedback/clarification as I don't totally understand the system myself.
Okay, so you've joined the site. Now you feel like talking with the community? Here's how you do it! This only applies to PCs, as I don't personally know how this all works on a phone, but the concept should be the same, the buttons just might be in different places.
Once you've signed in, you should see the tab Discord(Chat) in the main header at the top of the page:
This should open up this screen, which shows you an overview of the discord server. It's not very important or interesting, just click the "Connect" button at the bottom
If you already have a discord account, this will automatically connect you to the server. If you don't, you will first have to create an account. It won't take long, but please make sure the E-Mail Adress you use for the forums and for Discord are the same.
Once you're in the discord, you have to sign out of the forums. r I suggest using the discord desktop app, as it's easier to use, less likely to break, and also makes this easier.
Next, you have to sign in again. Make sure that when you do this, you are on the discord server, as that is where the syncing happens. But instead of using your username + password, this time you'll use the "sign in with discord" function.
If you did everything correctly, you should now be able to click your profile on the discord server, and see the "member" role come up. If not, try again/ask for help, we'll walk you through it.