Here’s a clear and correct English version of your text:
Bicycle in very good condition, second-hand. Purchased about one year ago. I used it while studying at Faiza College, but it has not been used for the last six months.
Your safety matters to us!
Only meet in public / crowded places such as metro stations and malls.
Never go alone to meet a buyer / seller, always take someone with you.
Check and inspect the product properly before purchasing it.
Never pay / transfer any money in advance before inspecting the product.