You can add a launcher to a panel in one of the following ways:
From the panel popup menu
Right-click on any vacant space on the panel, then choose Add to Panel. The Add to Panel dialog opens.
To create a new launcher, select Custom Application Launcher from the list. A Create Launcher dialog is displayed. For more information on the properties in this dialog, see Section 4.5.3 ― Launcher Properties.
Alternatively, to add an existing launcher to the panel, select Application Launcher from the list. Choose the launcher that you want to add from the list of menu items.
From any menu
To add a launcher to a panel from a menu, perform one of the following steps:
From the file manager
To add a launcher to a panel from the file manager, find the .desktop file for the launcher in your file system, then drag the .desktop file to the panel.