There are no limitations on the trial version.
InDesign is not an EPS editor. You can try Illustrator but that’s not foolproof either. EPS is an archaic file format. Native files from Illustrator or Photoshop would be better, or use PDF.
EPS is a file format that is based on the postscript system which is old as Bob points out.
To discover it's origins you can open the EPS in a text editor like Notepad or similar (not Word or a Word processing program!)
The first few lines should give an indication of the program used to create the EPS.
Based on this you should use that program to make any edits.
Please note - that if it's a Photoshop EPS then reopening that in Photoshop will flatten (rasterise) all the vector layers if any, including text layers, vector masks and vector shapes.
Thanks a lot for the tip. I will open this with notepad right now!
But, if you don't have the original program, and in many cases the original file used to make the EPS, it is not editable. In this case you will need to place it, then mask out what is wrong and add it again. Identifying fonts can be very difficult, but you can try converting to PDF, and check the font properties of the PDF.