Once you have your server instance created login via ssh and install the following dependancies for Sipp.
yum install make gcc gcc-c++ ncurses ncurses.x86_64 ncurses-devel ncurses-devel.x86_64 openssl libnet libpcap libpcap-devel libpcap.x86_64 libpcap-devel.x86_64 gsl gsl-devel
Now that all the dependancies are installed download and extract the Sipp source code.
tar -zxvf sipp-3.3.990.tar.gz
The next step is to compile the Sipp application, so we need to go to the Sipp directory and run make.
Now Sipp is compiled and you can start using it with the following commands.
./sipp -sn uac -d 200000 -s 123456789 127.0.0.1 -l 10 -r 2 -m 10