Setup Citus extension in a ssh environment

I tried to do CREATE EXTENSION citus;. However, I was given the following error:

ERROR:  Citus can only be loaded via shared_preload_libraries
HINT:  Add citus to shared_preload_libraries configuration variable in postgresql.conf in master and workers. Note that citus should be at the beginning of shared_preload_libraries.

However, I do not have root access. How can I create the extension in this case? I am using PSQL's source code for setting up the database. Is there a specific file in here that I can modify to allow for the extension? Here are the list of files in my postgresql-15.3 source code folder:

COPYRIGHT    GNUmakefile.in  INSTALL   README	   config      config.status  configure.ac  doc
GNUmakefile  HISTORY	     Makefile  aclocal.m4  config.log  configure      contrib	    src