How can we honor the saints? We can honor the saints: first, by imitating their holy lives; second, by praying to them; third, by showing respect to their relics and images.
Brethren, be imitators of me, and mark those who walk after the pattern you have in us. (Philippians 3:17)
When we pray to the saints what do we ask them to do? When we pray to the saints we ask them to offer their prayers to God for us.
Further reading: CCC 956