Having more than one account
Unless you have a clone and you want to give your clone the ability to make sick business connections, there is no need to have two accounts. Von Rosen says that sometimes people change jobs and create a new account, forgetting they created one years ago. The problem is that LinkedIn doesn't take kindly to the duplicates, and the company may ask you to choose one or the other.
If you do have two accounts active, the better choice would be to message their customer-support people and ask them to merge your accounts. The process won't be perfect (you might lose some recommendations in the process), but at least you won't look like you make a new profile every time you get a new job.
Not having a custom URL
Von Rosen says she often sees solid LinkedIn profiles that inexplicably don't have a custom URL. There's probably a good reason for that, and it's because LinkedIn doesn't make it easy to do. Lucky for you, von Rosen made a YouTube clip to show you how. And even better: once you have that custom URL, your LinkedIn profile will likely show up even higher in a browser's search results. Since you've taken the time to improve your profile with all this knowledge we've been dropping, you'll be glad even more people will be exposed to it.