Constraint Error Message

Hello. I am new to Shapr3d and 3D designing in general. I am following along with one of your YouTube videos…“Sketch Constraints and Splines”. I am at 3:04 in video and I cannot move the point. I get the error message “Locked or constrained sketch parts cannot be moved” Also, I tried changing the angle at 3:17. I get the error message “This constraint would conflict with existing ones”. The only constraint I have is the horizontal/vertical that the video said to do. I have tried looking thru the resources on your website and posts here, but I cannot find solution. Help!