You can delete that by deleting history of browser. Browser history contains the sites that you have ever visited.
click on tools. it should say delete browsing history in the list.
previosly visited sites from that computer
you dont visit sites like that
not unless they look under ALL your history, which is some where in the computor settings
I dont know what version of computer you have, but on mine you can go to your favorites (top left hand corner marked by star) and then a tab will say "history". From there you can choose what day and then delete the sites that you dont want shown.
If you go to your history, you can click on the site you want to earse and hit the Delete button on your keyboard
Click on the open book icon in the upper right part of the window. Then, select the "History" tab. Once there, it will show you the recent sites you have visited. Right click on the piece of history you want to be deleted, and the click "Delete".
History maintains all the sites a user has visited, Each browser has it's own history maintained.
Your parents may be able to check if they are the administators of the wifi, but otherwise just delete the browsing history
if your using internet explorer the in the SAFY tab on the top find "Delete browser History.
go to the favorites (where you see the star. usually in the left corner of screen) and right click the one you want to delete. it will give you a choice between expand, collapse, or delete. You click delete, obviously. If you want to find more things to do with your computer, go to Howiworkelectrics.com