If you can read Hindi you can read Nepali because Nepali language is also written in Devanagari Script. If you can understand Hindi you can understand 80% of Nepali language. Some of the sites on the have published Nepali poems.
(1) Sanjaal
Sanjaal is largest collection of Nepali poems online. It is already a popular website for poems.
(2) Nepalforum
Nepalforum has a collection of Muktak, but you may not be able to read it, so you need to install Preeti Font, you can download this font there.
(3) Kabyam
Kabyam is a collection of Indian Nepali poems.
(4) Keshuvko
It is a personal blog, sometimes an article is posted and sometimes a poem, sometimes in English and sometimes in Nepali.
(5) Deepakraithegorkha
It is a personal blog with posting on many topics of interest, blog is written in Nepali, Hindi and English language.
(6) Bogatibimba
Bogatibimba is a collection of Nepali poems.
I am daily user of this website as there are lots of information and list of websites. Thanks and keep it up.