The plotting of a Catalina Surveys DR2 (Data Release 2) light curve from the Internet is similar to the plotting of an ASAS-3 or ZTF light curve, both of which are explained in detail in this User Guide.  

The Plot light curve from Catalina Surveys DR2 dialog box consists of two sections: the upper one is labeled Star name, and allows to enter the AAVSO VSX or SIMBAD name of the star to be plotted, or its (J2000.0) RA and Decl coordinates. Both values have to be separated with a semi-colon. RA and Decl need to be in sexagesimal format with values separated by spaces. So, a valid entry would be: 04 59 13.57; -69 35 43.3. Or its (J2000.0) RA and Decl coordinates, expressed in degrees and separated with a semi-colon. Example: 76.80654; -69.595361.

The fields in the Additional fields section are identical to the ones found in the ASAS-3 and ZTF descriptions.

If multiple objects match the search criteria, Peranso will ask you to select one, from the list of (unique) Catalina Surveys DR2 object identifiers of each matching object.