Hi @thaliac ,
To ensure that you get the correct part, what is the full model number of the laptop, as there are two Ideapad 500s models which use different parts for the charge port?
According to p.71 Miscellaneous Parts > Item #c the part number for the DC-In cable for an Ideapad 500s 13ISK is 5C10J30918
According to p.79 Item #9 the part number for the DC-In cable for an Ideapad 500s 14ISK is 5C10H71415
There is also an Ideapad 500 15ISK (just in case this is your model) where on p.101 Item #g there are 2 DC-In cables shown, depending again on which particular model you have i). DC-IN Cable C Z51-70 DIS 5C10J23750 and ii). DC-IN Cable C Z51-70 UMA 5C10J23774.
Once you have determined which exact model you have, (look at the information label under the laptop) if you search online by using the part number only, appropriate to your particular model, you will get results for suppliers of the correct part.
The hardware maintenance manuals that I linked for each of the laptops, also details the necessary pre-requiste steps and then the procedure to remove/replace the DC-In cable so that you should be able to do this yourself.