I can't install Tor Web Browser

[Humble]

hello everyone i just installed linux lite i am new i dont know anything except using firefox i tried to install tor browser and found this topic LINK i entered the code that guy gave in terminal then entered my password but i got this :

Code:

E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)
E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?

what i should do? correct me if i am doing something wrong thanks