Contributing to AnsPress via GitHub

Hello AnsPress Owner(s)/Maintainers,
As mentioned in 2 separate questions that I posted on the Support Forum, I have 2 enhancements to AnsPress given below that I would like to contribute via GitHub pull request:

1. Added a new filter to customize the Ask Button text on the base page. Default Text is ‘Ask question’.
2. Added new validate method ‘is_checked’ for the Checkbox field. This method will help in situations when the checkbox field is required to be checked before the form (Ask Question Page) can be submitted.

I have tested my changes locally and it is working perfectly as expected. Could you point me in the right direction to submit these changes. Do I create a fork on AnsPress project in GitHub, make the changes on the fork, commit the changes and then create a pull request? Also, can I submit both changes in a single pull request? Please specify the steps and I will submit the enhancements on hearing from you. Thanks!