For iOS users, there are three ways to sign up to HudApp. First is with your Apple ID. Second is with your mobile number. Lastly, it's with your Facebook account. If you are using android, you may use the last two options.
However, during the time of testing, signing up using the phone number is having some error even if it was tried using different devices and numbers.
Once you've chosen from the sign-up options, you will be asked to enter your location, identify your gender, chooses whether you are signing up as an individual or as a couple, choose whether you are interested in women, men, everyone, or couples, and the last question is about your birthday.
Upon finishing that part, the screen will show you the page about notification settings. You may choose "Notify Me," or "Not now" based on your preference.
It seems that that's the end of it, however, the registration process will not be successful unless you agree to start the 7-days free trial.
If you are using your Apple ID, you need to link it and the subscription payment will be charged to your account after the trial period. If you are using your mobile number and Facebook account, you need to link your credit card so you can proceed and check your profile.