The portal only allows one user session at a time. In order to switch between instances you will need to sign out by clicking the user icon in the top right corner and signing out.
To log into the portal again go to app.taktikal.com and enter the email address for the desired account. Next, check your email for the magic link to open the portal.
Having two accounts open in separate windows.
If you need to be able to have multiple accounts open at the same time you can do that using incognito windows.
First log in to the first account using your normal method.
Next open an incognito window on your internet browser and go to app.taktikal.com and log in using the other account email.
When the email arrives from the second login, right click on the button in the email and choose "Open link in Incognito Window".
You can now have multiple accounts open at the same time.
Switching users on the .is portal
If you have access to more than one account you can easily switch between users by clicking the user icon in the top right corner.