question about the guitar chords on this site

I've only started to learn to play. On the guitar chords page on this site, what do they mean when they say "follow steps 1,3,5"? And what does the R on the yellow circles stand for? Slightly confused. Thanks

i'll guide you a bit through your questions

first of all what the "r" means is in the faq i think

anyway "r" stands for root it means it's the main note of the chord like a c major chord , c is the root so the root always gives the name to the chord

now i'll explain 1-3-5 etc , these numbers stand for the number of which they are in the scale like a c major scale
c-d-e-f-g-a-b-c 1=c(1= same as root) , (3=e),(5=g)

so these numbers (1-3-5) just stand for the 1st,3th and 5th note of the scale

the 1st , 3rd and fifth note are also the notes which make up a major chord , so i think they are talking about this when they say follow steps 1,3,5