The Access manager requires that you have rights to the "Access Manager" license. YOU decide what permissions it needs, not us, that is discussed elsewhere.) The Access Manager is on the Configuration page

Start by opening the main menu

Start by clicking on the main menu button on the left panel, top left portion.

If the menu button isn't visible, you are likely on a screen too narrow to see everything, press on the left pointing gold button to take you so you can see the menu button.

Once the menu is up, the exact location of the configuration button depends on how wide your window is and how many options you have access to. On most it will be at the top of the 2nd or 3rd column of the menu but on a cell phone or narrow window, it will be down partway in the first column.

Then from there you choose the Access Manager, or what we call the funny green key

You can also click on the right hand V button in the main menu (if you don't already have it open), noting if you do it this way, you can directly pick the Access Manager tool that you want to go into.

From there click on the UI Configuration button