You can add icons in the top bar of your portal. You can quickly and easily switch between all your apps. But how do you get the apps at the top of your bar?
If you click on the upper right square on the left of your name, there will open a menu with all of your icons. All you have to do is click on the icon and drag it to the bar at the top.
It may be that you are missing an icon, that is possible because you have not added it to your menu. You can then click on your name and then you will be redirected to the page 'Explore more apps. Look well among the various apps if it says 'add to menu'. If that's the case, then you click on it and then you will see that the apps are added as an icon.