The Perama shuttles which run out to the major tourist destinations across Bali don't come into the main Seminyak area. So, if you want to get a Perama bus, you'll need to trek down Kuta way to where they depart from Jalan Legian, just north of its junction with Poppies I. It's not walking distance - you will need to get a taxi to there.
Transport around Seminyak is predominantly undertaken by taxi. The Blue Bird Group are the most reputable and start at 5,000 rupiah for short journeys and cost about 20,000 rupiah for the slow crawl to and from Kuta.