I assume you want to blend the small “bumps” with the fuselage.
What command are you trying to use? BlendSrf is usually used to fill a gap between surfaces, not to blend surfaces along a coincident edge. To use BlendSrf you will need to first trim the surfaces to create a gap.
An alternative is to use FilletSrf which will create a fillet (with circular arc sections) between the surfaces, or ChamferSrf which will create a chamfer between the surfaces. You can also use one of these commands, delete the resulting fillet or chamfer, and then use BlendSrf to create a smooth blend surface between the original surfaces.
One edge of the “bumps” is split. Is there a reason for this? Split edges sometimes create problems.
The “bumps” are 2 edge surfaces which results in skewed isocurves. This can cause difficulties. A better approach to modeling the bumps would be to have top and bottom “rails” and use Sweep2 cross-section curves of the desired shape.