You don't necessarily have to make a profile. It's just a section of the site to search for jobs but you need to be logged in. Some of them you can apply using your linkedin profile info (I think it'll ask for anything missing) but mostly it just links to the companies own website advert where you apply directly.

Be careful with the adverts by recruiters. I have a specialist job and have actually had more luck with recruiters, which I found through these adverts but it depends on the industry. I still found some lied to get contacts or sent me stuff completely different to what I asked for.

I have to say, companies take the piss now so be prepared to be annoyed. You have to set up an account for each company, upload your CV but they still ask for all the info to be put in manually, each slightly differently. Half of them use Workday but you still need separate accounts for each, and they have slightly different questions.

Then they don't bother to respond unless they want to progress or sometimes you get an automatic rejection after several months. You have no idea if the job already has several candidates in progress, if they have someone internal but their policy means they have to advertise the job, or god knows what else. Try not to get yourself down if you don't get any responses. It's really normal. It just becomes a numbers game so try to apply for x number of jobs each day or week, and you will hopefully find the right advert at the right time.