DD1 is TT and this is what worked for us - every 20-30 minutes "its potty time!" put her on. if she did something - throw a party - if not, good girl anyway! sticker for your potty chart.
we had plain stickers for going to the potty and special sparkly ones for wees or poos
we also had the potty in the lounge. within a week she started telling me when she needed to go - so we didnt need to go every half hour. it was hard work but def paid off!
sorry, im typing one handed
HTH!