Rugby player trying to gain weight.

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Hi everyone, I play scrum-half and fullback at Blue Sharks Rugby Club in Lima, Perú, I am 21 years old and my height is 163 cm and weight 60 kilograms. I find it really difficult to gain weight now, and my goal is to reach 70 kg. When I started playing rugby 2 years ago my weight was between 50 and 53 kgs.
I run a lot because of the position I play, and I am currently having a 2500+ calories ingest (it's been 4 days since I started using MFP).

Any recommendations? Please help me out, lot's of vibes for everyone.