The table is called WPDBD_TEIL. The primary key is TID. In WPDBD_TEIL there is a column called BILD(german: picture/image) from type BLOB.
Then go to your report, click on edit for the whole report and use the following code
select "TID", "TNAME", "PREIS", decode(nvl(dbms_lob.getlength("BILD"),0),0,null, '<img height="100px" width="100px" src="'||apex_util.get_blob_file_src('P9_BILD',TID)||'" />') "BILD" from "#OWNER#"."WPDBD_TEIL"
If you’d open the report now, you only get the HTML Code. So you have to change the way APEX displays the entry. So go to the report, click on BILD and change Display as Text to Report Standard Column
The form I used was the following.
Also, in the last page of creating the form, you have to chose your own primary key, not the ROWID.