My United Plugins effects do not appear correctly in my DAW on Mac.
High Sierra and newer OS X systems require rebooting the computer after successful installation. The plugins will be listed in the place you wish right after the restart...
I cannot find any User Manual
You can reach the online documentation by right-clicking in the plugin GUI area. Selecting the "Question mark" button in the menu will get you to the particular plugin's manual in the documentation section on our page. And since you are in the section already you may find the desired document in the menu on your left.
Have you not found the answer to your problem in this section? Do not hesitate to contact us.