Translations:Keyboard Shortcuts/9/en
To assign a shortcut to an action that does not have one, first locate it on the list of shortcuts by selecting it with the up or down arrow keys. If then the tab key is pressed once, another list will be announced, which contains the shortcut or shortcuts that belong to that action (there can be more than one indeed). Tabbing once more will place the focus on an add button, tabbing one more time will place the focus on a delete button.