Blue segments are portions of existing trails, orange segments represent "connector" segments.
Click each segment from start to finish (we'll try to fill in the gaps if you miss a segment!), click View Trail to see the resulting length and elevation profile.
Hover over the magnifying glass on any segment to see it highlighted on the map; deleting a segment will remove all segments past the one you delete.
When you're done, click Save Trail to get a shareable link of your trail, and spread the word!