You use the Tabs panel (Window > Type > Tabs) to set tab stops for a paragraph or type object.
You can access additional commands and options in the Tabs panel menu. To use this menu, click the triangle in the upper right corner of the panel.
You can position the Tabs panel anywhere in the work area; however, it is usually helpful to align the Tabs panel with a type object.
By default, you can position tab stops anywhere along the tab ruler.
The units of measure for the tab ruler are defined by the General units settings specified in the Units & Display Performance preferences (for all files) or by the units specified in the Document Setup dialog box (for the current file).