Change start date

Hello. I’m new to the group and training peaks. I just purchased the gold level subscription to prepare for a 100k event in 8 weeks. I’ve been training/racing for some time and have the basetraining to finish well. My plan starts today but my race is in 7weeks. How do I change the start date to reflect the race date? Sorry if this covered elsewhere. I couldn’t find a post on the topic. Thanks