Doing something "actively" means that you're working on it and directly trying to do it. In the example above, the company isn't trying hard to find a new employee yet.
The opposite of "actively" is "passively". To understand the difference, think about two ways that you can search for a new job:
- actively searching for a new job means responding to job postings, sending your résumé to lots of companies, attending networking events, and so on
- passively searching for a new job means doing something like posting your résumé on an Internet job board, and waiting for interesting companies to contact you