To share your cycle with your Partner you need to be a Cycles Premium Member and your partner needs to have an Apple device. Once you're a Cycles Premium Member go to Profile > Partner Connect > Share Link with your partner. Once your partner receives the link it will prompt them to download the app. Once they download the app, and click the link again the app should open up and inform them that you are trying to connect with them. Have them sign-up for an account and they should receive an email verification code. Once they verify their email and create an account it will show that the two of you are connected. The partner account can see cycle information but can't see personal logs from the main user.