In Materials palette create a new Material and load your logo image for Color Map and Transparency Map. Select Use Alpha Channel in Transparency Map options.
Note, your image must already have a transparent background for the Use Alpha Channel option.
Select Decal tool then click on object and the Decal dialog is invoked, as shown.
Note, Decal tool can be found in Rendering/Animation Workspace or with Spacebar then D key.
In the Decal dialog click the green (+) button to create new decal.
Click Set Material button and choose the logo image material you created previously.
Turn ON Draw Tiles to see blue rectangle representing the location of decal.
In Proportions pull-down menu choose Color Map to lock horizontal and vertical size ratio to prevent stretching your logo image.
Type numeric values for Horizontal Tiling and observe the Vertical Tiling automatically updates to keep image proportions.
Move and Rotate widget in preview window to locate decal as desired.
Click Deselect All Faces button then click on only the faces you want to see the decal.
Note, in this example we clicked on just the front face so the decal does not show on back face of glass.
Click RZ button in lower right corner for a quick preview rendering. Note, must perform RenderZone rendering in modeling window to see full quality.
Make any additional adjustments as desired then click OK button when satisfied.
RenderZone render in modeling window to see decal. Note, decals are not visible in Shaded display modes.