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how are you trying to give out the link to your form?
This link: http://www.jotform.com//?formID=50277545401350 that you have included on your post directs you to the Form builder of your form, that is why it's asking for login information.
For them to access you form, you can give them your form URL that you can find when you click Preview.
Here is the Form URL of you Form: http://www.jotform.com/50277545401350
I hope this helps. If you need further assistance, kindly let us know and we will be glad to help you. Thank you.