Create a new environment variable called PROJECT=MERCURY and make it persistent by adding the variable to the ~/.profile file

I am able to add using export but unable to add it to profile.
Tried using Hint : Use export PROJECT=MERCURY
and add the value to the .profile by running echo 'export PROJECT=MERCURY' >> /home/bob/.profile
But unable to complete it pleas help me

bob@caleston-lp10:~ env OLDPWD=/home/bob VISIBLE=now XDG_SESSION_ID=c1 USER=bob PWD=/home/bob HOME=/home/bobPROJECT=MERCURYMAIL=/var/mail/bobSHELL=/bin/bash TERM=xterm SHLVL=1 LOGNAME=bob XDG_RUNTIME_DIR=/run/user/1000 PATH=/home/bob/.local/bin:/home/bob/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/home/local/bin:/home/mercury/bin:/home/local/mercury:/bin:/mercury/bin _=/usr/bin/envbob@caleston-lp10:~

That looks right. can you show the contents of the .profile file?