Select the folder where you want your Steam games to be installed, then click “Select” in the bottom-right corner. If necessary, click the “New folder” button in the bottom corner. Locate your new drive, or the new location you want to assign to Steam games. In the bottom-left corner of the “Steam Library Folders” window, click “Add library folder”. To add a new Steam library folder, click “Add library folder” in the bottom-left corner of the “Steam Library Folders” window. Click “Steam library folders” at the top of the “Downloads” tab in the settings.
Once in Steam’s settings, switch to the “Downloads” tab, and click “Steam library folders” at the top. Open the Settings by clicking “Steam” in the top-left corner of the main Steam window, then clicking “Settings”. To do so, open Steam’s settings, by clicking “Steam” in the top-left corner of the main Steam window, then click “Settings” in the drop-down menu.