Working with hyperlink buttons
A hyperlink button is inserted in the center of the current slide. In most cases, that is not where you want it to appear. To edit the text or size of a hyperlink button, or to move it to another place on the slide, first display the Form Controls toolbar (View > Toolbars > Form Controls). Select the Design Mode On/Off icon (upper right corner of the toolbar).
Now you can click on the button and drag it to another position, or right-click to open a dialog box where you can change the text on the button, the size of the button, and other properties.
When you have finished editing the button, click the Design Mode On/Off icon again to make the button active again.