Hi Steve,
May I know which LMS you are trying? When you select reproting mechanism as Tin Can and upload & launch the course on SCORM Cloud should work without any modification by author. LRS end point is provided by the LMS. User doesn't need to add it. To get more information check Launch section in https://github.com/RusticiSoftware/launch/blob/master/lms_lrs.md.
In case if you want to send statements to multiple LRSs, you can configure the end points in tc-config.js file. more info at http://scorm.com/scorm-solved/scorm-driver/scorm-driver-quickstart-gui de-2-update-titles/
Defining and customising the statements are not possible with Captivate 7.
Thanks,
Sankaram.