Wait at the bus stop, which will have either a shelter or a signpost. (Some stops have electronic signs that display bus numbers and waiting times.)
When the bus arrives, board at the front.
Validate your white cardboard T+ ticket immediately in the stamping machine, or buy a ticket from the driver if you don't have one.
When you're ready to get off the bus, press the nearest red button to activate the "stop requested" sign. (You'll see red buttons scattered throughout the bus.)
Leave the bus through the rear doors.

Note:

If you're traveling with the Paris Visite pass, follow the validation and usage instructions in the accompanying booklet. Do not insert the pass's ticket in the stamping machine on the bus; show it to the driver instead.
The "how to" instructions on this page apply to standard Paris city buses, which can be identified by their route numbers. For information on the Balabus tourist bus (which connects the major sights from April to September, on Sunday afternoons, and on public holidays), see the Balabus page at the RATP Web site.

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