first using "text speak" is disliked around here
this forum is NOT a telephone sms message
Please is NOT spelled "plz"
as to squid
have you read the instructions for using "apt" ?
first start with a search
-- i use "su - " on Debian 8.2
apt search squid
--- one of the results is ---
squid3/stable 3.4.8-6+deb8u1 amd64
Full featured Web Proxy cache (HTTP proxy)
----- then from the list install it ------
apt-get install squid3 squid3-common