Hi, the editor you have used has noted a few errors as listed in the boxes directly above this text.
The main warning is "warnings:crossing_ways:highway-highway" of which there are 11 instances.
Where one track/path/footway (called a type of highway in osm) crosses another you need to put a node at that point to join the two where they cross.
If a way crosses a stream you normally add a ford to the crossing point if you cross through the water. If there is a culvert or pipe with the way passing above it then you would not join the two but instead split the small section of the waterway and add a culvert. If a bridge takes you above the waterway you split the way you cycle or walk over at each end of the bridge and add a bridge tag to that section.
I am not sure of the details of the impossible one way but it means you can't leave that section with out traveling against the one way direction.
This one likely has occurred where you have not joined end of the way to the one it should connect to. You may need to double click to join lines in the iD editor but I am not very familiar with iD.