Quoc, you really ought to start taking on more responsibility for finding things yourself. Take advantage of online dictionaries and search engines such as Google: http://dictionary.reference.com/browse/URL
That must be the rule of the forum she is on. They only allow people to post links to sites after they have made at least 5 posts on the forum. So if we had that rule, Yankee would have had to have made at least 5 posts before he/she could have posted that link to help you.
Presumably it's to try to stop people just advertising their own sites.
1/ Yeah, she is only allowed to post URLs to other sites after she has made 5 posts or more.
URL means website address. sites also means website address. So, why post websites (URLs) to websites (sites)? Why don't they say post your sites on this forum?
When they say 'urls to other sites' they mean the urls OF other sites. It's badly phrased. It's a link to the url of another site.
You are getting a bit confused between their site and other sites. In question 2 sites is plural because they are talking about the links to any number of sites outside the forum they are posting on.