When your membership is about to expire, the system will send you reminders via email. One is 6 days before the expiration day, the other 2 days. You will get another reminder right after it is expired. You can follow the instruction on the reminder to renew your membership.
If your membership is still valid, you may also log into EventDove and follow on 【My EventDove】→【My Group】to locate and visit the group you want to renew. On your profile page, click on the 【Renew Membership】link on the left side bar to renew. Please note that your new membership will start on the day right after your current one expired. So renewing your membership in advance will keep you group benefits uninterrupted and no loss to your current membership.
If your membership already expired, you need to locate your group first either by searching your old emails or contact your group owner. Then log into EventDove and visit your group. You will see an expiration notice on the screen. Just click on the 【Renew membership】 button to renew. Your new membership will start right on the day it is renewed.