If you are searching Web of Science, there are two ways to find out the impact factor of a journal. The impact factor is a measurement that takes into account how many times the journal's articles are cited, and may reveal something about the journal's reputation.
1. Go directly to Journal Citation Reports and select search by journal title. Then click on Journal Ranking. Q1 means 1st quartile, Q2 means 2nd quartile, etc.
2. Search the database by topic. When you are looking at the abstract view (full record), scroll down and look in the right hand column where it says Journal Citation Reports. Follows the links to the journal page and find the link labeled Journal Ranking.