Hello and welcome to the forums - thanks for joining!
Sorry if this is slightly wrong, as I am now using a custom ROM on my phone but if, from one of your homescreens, you hit the menu button, you should then be able to hit "settings" and then there should be "Wireless & Networks"... within that there should be the option to turn on WIFI... once it's on, it shouldscan for possible networks and you should be able to connect to your's.
Hope this is of some help... don't forget to check out Samsung Galaxy Ace - Android Forums (as it's where other users of your device hang out).
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