Welcome to italki! Italki is a marketplace that connects paid teachers and students. Teachers list their prices and hours. Students choose a teacher, then choose a time, then take a lesson at that time. After the lesson, the teacher is paid. Italki also has a language exchange. People who speak language A and who want to practice language B pair up with people who speak language B and who want to practice language A. Sometimes, it is difficult to find a person who wants to learn your language, who is available at convenient times, and who actually shows up at the agreed times. Italki also has forums. There is a question forum for grammar and vocabulary questions. There is a notebook forum for posting texts and getting corrections from native speakers. Good luck!

Just keep trying, but be clear. If you want a language exchange partner, say: 'Do any English speakers want to learn Arabic?' and, If you want to practice speaking English with anyone, say: 'Does anyone want to practice English with me?' Good luck! :)