If you know the number of a resolution, e.g. General Assembly resolution 62/24, you can locate it by accessing the UN Digital Library. To search for the resolution, you will need to build a UN document symbol:
You can search for Resolutions in the UN Digital Library by using words that appear in the Title, e.g. "Multilingualism". You will be able to access all documents pertaining to your chosen Title and select a particular Resolution from the list.
When you search for a resolution in the UN Digital Library, you can also find a lot of other information related to that resolution, including the draft resolution, the associated meeting records and the sponsors of that resolution. For more information, see this video about finding resolutions and related information in the UN Digital Library.
Consult the following section of the UN Documentation Research Guide: