Run Aqua for the first time
You can use the Toolbox App to run any JetBrains product. In case of a standalone installation, running Aqua depends on the operating system:
To run Aqua, find it in the Windows Start menu or use the desktop shortcut. You can also run the launcher batch script or executable in the installation directory under bin.
Run the Aqua app from the Applications directory, Launchpad, or Spotlight.
Run the aqua.sh shell script in the installation directory under bin. You can also use the desktop shortcut if it was created during installation.
Once you launch Aqua, you will see the Welcome screen, the starting point to your work with the IDE, and configuring its settings. This screen also appears when you close all opened projects. Use the tabs on the left side to switch to the specific welcome dialog.

Customize the IDE appearance
Click Customize and select another color theme or select the Sync with OS checkbox to use your system default theme. Here you can also configure accessibility settings or select another keymap.

Configure the default settings
Click Customize and select Import Settings if you already have a copy of the required settings that you want to apply.
Alternatively, click All settings to open the settings dialog. The settings that you modify at this moment will become the new default configuration for your projects and the IDE.

Install additional plugins
Click Plugins in the left pane and download and install additional plugins from JetBrains Marketplace.

Start a project in Aqua
When you start Aqua, it will show you the Welcome screen.
From the Welcome to Aqua dialog, you can do the following:
