Yhyjyk

friends
i have posterbox and i want to put text in this box.
Please see image

Minimal working example:

documentclassarticle

usepackagetcolorbox
tcbuselibraryposter
usepackagetikz

usepackagelipsum

begindocument

begintcbposter[
 poster = 
 columns=1,
 rows=2,
 spacing=3mm,
 height=14cm,
 width=12cm,
 ,
 ]
 posterbox[
 colframe = red,
 width=13cm, height= 10cm
 ] includegraphics[height=4cm]example-image-b

endtcbposter

enddocument

Add "ABC" and "XYZ" like attached image
Thanks

With skin library you can draw whatever you want on a tcolorbox, with exact coordinates.

documentclassarticle
usepackagegeometry
usepackagetcolorbox
tcbuselibraryskins
pgfsetlayersmain
begindocument
begintcolorbox[
 width=13cm,height= 10cm,
 skin=freelance,
 interior code=%
 path (frame.south west) -- (frame.south east) node[midway,above=1ex,font=Largesffamily] ABC;
 path (frame.south east) -- (frame.north east) node[midway,rotate=90,above=1ex,fill=yellow,font=Largesffamily,inner sep=8pt] XYZ;
 ,
 frame code=%
 beginpgfonlayermain
 path[draw=red,fill=gray!20,ultra thick,rounded corners] (frame.south west) rectangle (frame.north east);
 endpgfonlayer
 ,
]
includegraphics[height=4cm]example-image-b
endtcolorbox
enddocument

You can use ordinary TikZ commands in a tcbposter environment.

documentclassarticle

usepackagetcolorbox
tcbuselibraryposter

usepackagelipsum

begindocument

begintcbposter[
 poster = 
 columns=1,
 rows=2,
 spacing=3mm,
 height=14cm,
 width=12cm,
 ,
 ]
 posterbox[
 colframe = red,
 width=13cm, height= 10cm
 ]name=A,column=1includegraphics[height=8cm]example-image-b
 node[font=sffamilyLarge,rotate=90] at (12,9.6) XYZ;
 node[font=sffamilyLarge] at (6,5) XYZ;
endtcbposter
enddocument

Or you can position these nodes relative to the picture.

documentclassarticle

usepackagetcolorbox
tcbuselibraryposter
usetikzlibrarypositioning
usepackagelipsum

begindocument
begintcbposter[
 poster = 
 columns=1,
 rows=2,
 spacing=3mm,
 height=14cm,
 width=12cm,
 ,
 ]
 posterbox[
 colframe = red,
 width=13cm, height= 10cm
 ]name=A,column=1includegraphics[height=8cm]example-image-b
 node[font=sffamilyLarge,rotate=90,right=-5mm of TCBPOSTER@A] XYZ;
 node[font=sffamilyLarge,below=-10mm of TCBPOSTER@A] XYZ;
endtcbposter
enddocument

Or you can just use a table and rotatebox.

documentclassarticle

usepackagetcolorbox
tcbuselibraryposter

begindocument

begintcbposter[
 poster = 
 columns=1,
 rows=2,
 spacing=3mm,
 height=14cm,
 width=12cm,
 ,
 ]
 posterbox[
 colframe = red,
 width=13cm, height= 10cm
 ] begintabularcl
includegraphics[height=4cm]example-image-b &rotatebox90XYZ \
XYZ & 
endtabular

endtcbposter

enddocument