It only looks like you are out of Galaxy. Any selected fastq files will become a Galaxy History item. For example:
search for "ERA007448"
click on "ERA007448" (below "Submission (Read/Analysis) (1 results found)")
you get a big table, where one column is called: "Fastq files (galaxy)".
click on one files in this column, and you will get the Galaxy interface again, and the selected file will become your next History item (be patient, depending on the size of the selected file, it will take a while)
Hope this helps, Hans-Rudolf