The org admin has left the org and I am a site admin. How do I make myself an org admin and how I can remove the former employee from this role ? Please advise.
This is my current view in the admin page.
adding to the great how-to Vinod already set up for you I'd wanted to remark that, according to your statement and your screenshot, you are currently not org admin but "only" site admin.
That means you would need to get hold of your former admin once prior being able to do all the steps that are needed right now.
In case he already left a somewhat common scenario is to access their mailbox and reset the password.
If there is a second org admin you certainly can approach them also.
As soon as this is sorted out all the steps Vinod described precisely apply.
To remove a user’s org admin permissions:
Log in to admin.atlassian.com and select your organization.
From your organization, select Settings > Administrators.
Find the user in the list and select Remove.
Next, remove the user’s site admin permissions:
Go to your instance User Management (http://<instance>.atlassian.net/admin/users)
In the left menu, click Groups and locate the site-admins group
Find the user in the list and click Remove
To remove a user from your site:
Go to User management of your instance (http://<instance>.atlassian.net/admin/users)
Find the user in the list and go to their user details page.
Select the 3 dot icon at the top and select Remove.