If you have access to multiple accounts in Avinode and one user account it is easy to switch between the two.
After logging into Avinode with your credentials. You will be taken to the account you were using the last time you were logged in. To switch between your accounts you click on your profile in the top right corner of the page (if you have uploaded a profile picture of yourself it will be that picture here instead). In the drop down menu that appears, choose "Switch company". On the page that appears a list of all companies you have access to will appear and you click on the one you wish to switch to.