Before you begin job searching on LinkedIn, be sure your PROFILE is as complete as possible and that it clearly communicates your skills, brand and credentials.  Do as much as you can on your own, then ask colleagues or trusted business associates to review for their input.  Next, seriously consider hiring a career expert who can very often bring your PROFILE to an entirely higher level.  Most clients indicate it is well worth the time and limited cost it takes to polish up your online presence in this pivotal site. 

Once you are satisfied that your PROFILE you can click on the JOBS tab to begin delving into all that LinkedIn has to offer.  A simple search field will appear - click on advanced search just below that.  You will notice that you are given a lot more options by selecting this search method.  Also note that you cannot include salary as a parameter unless you are a premium member.  This might be well worth considering, especially if you are currently working and seeking a better opportunity.