Hi Samir,

Simply run a local BLAST on your dekstop using the available datasets at the following databases.

http://snoopy.med.miyazaki-u.ac.jp/

http://lowelab.ucsc.edu/snoRNAdb/

https://www-snorna.biotoul.fr/

Identify the best hits based on their E value and identity score and assign the function of its homologue to your query.

Hope this helps

Best

Sayak