Slack Onboarding Instructions
After clicking the invite link you received, you should be taken to a page that looks like this:
Enter your email, then head to your inbox.
You should have received something like this. Hit "Confirm Email".
Next, enter your name and create a new password. Note, if you already have an existing slack account, you can use the same email and password as that if you want to keep just 1 set of credentials.
And that's it! You should now be in the slack domi workspace:
in the screenshot above you can see I am using slack in Safari. Slack has desktop and mobile apps as well, which are recommended over the browser experience.