The position of the secondary, 3 cog chainring needs to be adjusted inward so it is closer to the frame. Here is the procedure.
The secondary chainring is bolted to the frame so the first step is to loosen the lock nut retaining the secondary chainring assembly. This locknut is on the left side of the frame and is hidden from view by a black plastic slip on cover. Once you remove that cover, you can loosen the nut with the multi-tool supplied with your bike. Hold the bolt end on the right side of the secondary chainring with a pair of pliers so the bolt does not spin while attempting to loosen the nut.
Completely remove the locknut and spacer on the left side of the frame and the threaded bolt that holds the secondary chainring will move freely on the frame. You can now pull the secondary chainring assembly for inspection.
At this point, please note that the secondary chainring is still attached to the bolt because there is another nut holding it on. There should be 1 spacer on either side of that nut retaining the secondary chainring to the bolt. If more than one spacer is on either side of the nut, that's the source of the problem. Remove the extra spacer and reattach the secondary chainring to the frame.
If there is just 1 spacer on either side of the chainring retaining nut, try tightening the inner retaining nut so the secondary chainring will be drawn closer to the frame. Be careful not to overtighten as this will prematurely wear the bearings in the secondary chainring.
If sufficient clearance is still not available, replace the existing spacers with thinner spacers from the hardware store.