No Code Signing Identity listed

Hello I have been having an issue with testing my app. I am only a child and have already programmed an app so please make your answer easy to understand. I have a starter on Corona, and built my app but no code signing things have shown when I didi the build command. When I tried using I-tunes to install my app it got on my phone but never loaded so I could try it and said “Installing” on my phone. When I tried installing it on my phone with X-code when I clicked the “+” under the devices category and selected my app file it said “No Code Signature Found” I do not know what a code signature is and would like to know ow to get one. One last question. On the Apple Developers page it says it costs $99.00 per month for an apple developers account, but on Corona it says I can launch apps for free on the iOS app store, and android for free am I able to launch apps for free? thank you for reading please help and reply to JtBodzy@sbcglobal.net Thank you

Hello I have been having an issue with testing my app. I am only a child and have already programmed an app so please make your answer easy to understand. I have a starter on Corona, and built my app but no code signing things have shown when I didi the build command. When I tried using I-tunes to install my app it got on my phone but never loaded so I could try it and said “Installing” on my phone. When I tried installing it on my phone with X-code when I clicked the “+” under the devices category and selected my app file it said “No Code Signature Found” I do not know what a code signature is and would like to know ow to get one. One last question. On the Apple Developers page it says it costs $99.00 per month for an apple developers account, but on Corona it says I can launch apps for free on the iOS app store, and android for free am I able to launch apps for free? thank you for reading please help and reply to JtBodzy@sbcglobal.net Thank you