how do I put a frame around my photos

In a presentation how do I put frames around my pictures.

Frames (under tzhis term) are only available in Writer. There is no object commonly named frame in impress.
Please clarify what you want to achieve.

The simplest way to get something looking like a frame around an image, is to set the Line properties for the graphic object. Every picture you insert is assigned to a shape object which has such a line property. To edit it call the respective item from the context menu (right click with the mouse).

Thank you. I saw the line properties but you cannot really make it look like a proper frame. Just a line with different colours and thickness.

I think you need to make clear what is “looking like a proper frame” in your opinion and where it should come from.
If you want to put a painting at a wall, you won’t expect the wall to provide a “prpoer frame” autimatically, wil you?
Did you look foe gallery objects usable as frames fort pictures?