Do the preparation task first. Then read the text and tips and do the exercises.
Preparation
Katie20
Can you believe it? Someone in another group asked me to write some pages of their website in English and French. But they can't pay because 'I'm starting this business with no money.' He said he's a professional photographer and he can do some photos for me instead. Am I wrong to be angry?
Asher87
Nope! I’d be angry too
JayCee99
I can't help but here's the link to a friend's website. He is a French–English writer and translator www.franco-anglo-translations.com/About
Carla62
Er … asking people to work for free … not cool!
Asher87
^^^ This!
JayCee99
Oops! I thought you were looking for someone. Sorry for the misunderstanding 
Carla62
I can't pay my rent with photographs, sorry
Katie20
Exactly!
Mylo45
True, but professional photos cost a lot of money, especially if you're getting married. Sorry I don't speak French or I would do it 
Katie20
Here's a link to his photography if anyone wants the job www.billsphoto.com/portfolio As you can see the website needs some work … 
Carla62
@Mylo45 Maybe, but people always ask writers to work for free #PayMe
Katie20
Yep, if I need photos OK but I prefer to get paid with money
Tips
1. Writing in online forums is more like speaking.
2. You don’t have to put full stops (.) at the end of sentences.
3. Use ^^^ to show you’re talking about the post above yours.
4. Use @ and a person’s name to show clearly who you’re replying to.
5. You can use emojis. 
6. Stay calm and be polite. Some people get angry in online discussions but try to avoid that.
Hello Odeta21
I'm afraid we don't allow links to other sites in our comments (which is why the one you included was deleted), but I would recommend Starting Out and LearnEnglish Teens Speaking skills videos as a good place to start.
All the best
Kirk
The LearnEnglish Team
Hello amit_ck,
All of those prepositions can be used after disappointed and none of them would be incorrect.
I think disappointed in is most often used about people, and disappointed by for results. In my view, disappointed with is the best-sounding of the three in this context, though all are possible.
Peter
The LearnEnglish Team