To renew, please use the small yellow "person" icon button the upper right to login to your account and follow the prompts to renew. You should be able to do this within your membership profile page. If your renewal expiry date is imminent, you may already see a small prompt on your lower right screen. If so, please click it, but only after you've made a final choice on your membership level.
See the below screenshot for a visual for changing your level. Please email Info@NSANewEngland.com if you have questions or any issues.