I need to put superscript and remove brackets in NLM style in Microsoft Word using the web basic online endnote.

It would be possible to do this?

In my text appears for example: Sunday(1,2,3) and must be 

Sunday1,2,3, i need step by step of all process.



You can not edit the online styles, unless you have an administrator for you Endnote at your institution (but I have never figured out how that works, Tech support may know).  

The best you could do is to try to find a superscript style.  Are you needing a footnote style, or when you are ready to submit, download a desktop trial copy and edit the output style to get what you need.  – 1,2,3 is unusual.  usually it would  be 1-3.