If you lock an element, it won't be move/editable until it's unlocked. For example, to change the color of a locked element, you need to unlock it first.
1. With your design open, click on LAYERS in the left-side tool menu and select the element you want to LOCK or UNLOCK.
2. You can also select the element directly from the TEMPLATE. When you select the element, a top toolbar will appear, and you can select the lock icon and LOCK the element.
3. To UNLOCK the element, click on LAYERS and click on the lock icon to unlock as needed.
4. When you FINISH, click SAVE.