If you are trying to view a new module in the Apps module you can do these:
Move the module folder into your addons folder
Enter developer mode (Settings>Activate Developer Mode)
Apps>Update Apps List
Search for module name. Remove "apps" filter if not an app.
If not visible, refresh your browser, then try again.
If you are making the module yourself, you can add the code below to your __manifest__.py file. You will need to refresh your Odoo server for the change to take affect.
'sequence': 1,
This should put it as the first item in the apps module when the 'apps' filter is off.
To view the module in the dashboard AFTER it is installed, you will need to make sure you have your permissions set properly. You can verify in the code of your module that you have permissions to read/write/create/delete by default, or you can modify in Settings>Users, or in Settings>Technical>Access Rights (in developer mode). Once you have proper permission, when you refresh your browser, it should appear.
@Gregory Gillis can you do provide me with the example