Please remember all the fun times singing and dancing with your friends in English!
Never forget the fun you had using English singing and dancing with your friends.
Please remember = 覚えて下さい、思い出にして
Never forget = 忘れないでね
All the fun times = たくさん/全部の楽しい時
Singing and dancing = 歌ったり踊ったり
In English = 英語で
Using English = 英語を使って
With your friends = お友達と