first you should have morpheus and ettercap (by my side i am using kali linux)
to install morpheus paste this in your terminal:
cd Desktop/
git clone https://github.com/r00t-3xp10it/morpheus.git
then choose the target from doing the sniffing and arp poisonning in ettercap
and run morpheus by typing in the terminal:
cd Desktop/morpheus
./morpheus.sh
and click enter
and click ok to activate the model
and leave it blank to arp poisonnig all the hosts
and select your target by typing it(you can have the ip from ettercap)
choose the third one and quit the help by doing ctrl+x
then morpheus while his work by deleting the tcp/udp packages
i hope u understand this
(i am sorry for my english)