To add a new issue to your IssueLibrary you can either add an existing issue from a project to your library or manually create a new entry.
Choose an issue from one of your projects and add it to the IssueLibrary by clicking the dots menu, then from the dropdown under Send to.. select the IssueLibrary:
If you're an Administrator, you'll be taken to the editor page and can make any necessary changes to your new IssueLibrary entry before updating the entry and saving it to your IssueLibrary.
If you're an Author, your Issue will be automatically added to the library as-is.
If you don't want to use an existing issue from one of your projects you can manually create a new entry in your IssueLibrary.
Next help article: Add an IssueLibrary entry to your project →