I have seen many ICOs with facebook and tweeter campaign but I am very confused on how to do the correct procedure in submitting your task.
You have to read first the rules and if you think that you are eligible then apply, follow the procedure.
I cannot understand on how to submit the url because I have seen joiners are posting their task in the page.
AFAIK, you just have to post the links of your tweets (for twitter) and facebook.
Is it correct?So that when time comes when I can now join in such campaigns, I can do it properly and my effort and time will not be waste.
Yes that's correct, when you are enrolled you have to do it properly and you need to follow the format.