[Plugin: Simple Link List Widget] New User

I just began using this today, and it worked great. My question…
When adding it to my sidebar, it only allows for the addition of 4 links (only 4 spaces to add links). Is this actually the case, or is there something I should be doing in order to be able to add more links to a given list?

Thank you so much.

http://ww.wp.xz.cn/extend/plugins/simple-link-list-widget/