When you click on "suggest links" certain words in your hub will be highlighted a gold color. This is an easy way to link to other hubbers, and hence increase your chance of sharing in clicks that might occur at that hub.
I put my cursor over the words and left click. A menu will drop down of all kinds of hubs related to that word. You will see a plus sign at the left of each hub. Clicking that plus adds it as a suggested link in your hub - it becomes active. When it becomes active the word changes from gold to blue. There is also a close box in the upper right corner of the menu.
I usually use the words that are related to my article. That way I am not frustrating anyone only interested in the hub topic. So if I was writing about an airplane trip, I might select a hub about travels to link to, but I might not select a hub about airplanes. I hope that makes sense. Although, I can see that if a person found a very interesting hub not related directly it might be something to activate in your hub? It's your choice.
When you have linked to every hub you wish, you can click at the top, "Done editing". I think that is all to it.
Have a nice rest of the day.