Hi, Dennis, and I hope you are finding WikiTree rewarding.
If you have gone to the Relationships feature and clicked on Richard Warren you will see the 13 steps in your possible relationship to him. At the end of each line you will see [unknown confidence] between about 11 of these relationships. I would go to each profile where it says unknown confidence and scrutinize the primary source documentation that shows that person is the offspring of the person above him in the lineage to Richard Warren. If there is excellent primary source documentation of that relationship, then you can click the Edit tab (on unlocked profiles) and in the far right column you can mark 'father is confident' and/or 'mother is confident' as may be appropriate. If you aren't sure or the documentation is questionable, post a question about it in G2G and other members will assist you with that.
Just because a profile reads unknown confidence does not mean there is an issue. This feature was added after many profiles were created and so many are not marked. And, it is a feature many WikiTreers don't take the time to use.
Good luck with it an feel free to post back here for any additional assistance.