Please bear with me, a total newbie.
Yesterday In managed to map a footpath close to my village having read numerous articles.
Today is a complete blank, I have managed to upload the gpx file and transport it to Potlatch 2, from here I have run into a brick wall regarding tracing.
I did it yesterday with one click which gave 22 nodes.
Please help my 71 year old brain, it needs it 
Roger