Your information is highly secure in KeepandShare - by default, no one can see any of your information, let alone edit it.

Furthermore, if you do grant others the right to view your information (by sharing it via the "Share With" controls), then by default they still cannot edit the information.

Edit rights are controlled by the "edit" checkbox in the Share With controls:

Your information can only be edited by others when you have shared it with them and also checked the edit box next to the Share With control.

If the box is checked, you can uncheck it by clicking on it. Then you should give a "Save" command to be sure your new setting is saved.