step 1: get all the articles with postman
step 2: copy one of the id's of the articles
step 3: paste that id to articleId like shown below, if id is 2 then you should right like this
{
"userId":"153344",
"location":"Ethiopia",
"eventType":"1",
"articleId":"2",
"communityId":"1234567",
"source":"1",
"timestamp":"123456"
}