Depending on the object or door... Look at the properties to see which script it uses (example- dooruse.fpi, doorremote.fpi, etc). Then look at the script and see where it points to the hud file. Then as Landman stated, you can edit that image.
The better way is to create your own image you want displayed and just change the filename that is mentioned in the script to point to your image.
For example. The default door uses this script:
;Artificial Intelligence Script
;Header
desc = Use Door (Push Open and Push Closed) & Auto Close
;Triggers
:state=0:hudreset,hudx=50,hudy=90,hudimagefine=languagebank\english\gamecore\text\pressentertouse.tga,hudname=usedoorprompt,hudhide=1,hudmake=display,state=10
:state=10,plrdistwithin=60:hudshow=usedoorprompt,hudfadeout=usedoorprompt
:state=10,plrdistwithin=60,plrusingaction=1:activate=2
:state=10,activated=2:state=1,setframe=0,sound=$0
:state=1:incframe=0
:state=1,frameatend=0:state=2,coloff
:state=2,plrdistwithin=60,plrusingaction=1:activate=0
;RICKS Auto-close feature (for all USE doors)
:state=2,anyfurther=100:activate=0
:state=2,activated=0:state=3,sound=$1,colon
:state=3:decframe=0
:state=3,frameatstart=0:state=10,setframe=0
;End of Script
The line that contains "languagebank\english\gamecore\text\pressentertouse.tga" is the filename for the hud image. All you need to do is point to your image file. All changed.
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