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If you are using xoops-2.2.3 (maybe earlier version db's are the same, I'm not sure) and phpMyAdmin 2.6.1:
1. select the XOOPS database you configured when you installed xoops
2. in the list of tables, find the one that's called "config" preceded by the prefix you defined when you installed xoops. For instance, my table prefix is "x" so my config table is called "x_config".
3. click on the config table to open it
4. look at the tabs across the top of the phpmyadmin page and one of them will say "Browse".
5. click on the "Browse" tab and all the records in the config table will be listed.
6. look in the column labeled "conf_title" for an entry called "_MD_AM_SESSEXPIRE"
7. click on the little pencil looking button on the same line as "_MD_AM_SESSEXPIRE" to edit the record
8. in the field called "conf_value" enter a new value, in minutes, for the new expire time
9. click on the "Go" button at the bottom of the page to save your changes
10. pray....
Since you don't state what version of XOOPS you are using or what version of phpmyadmin hopefully this will get you far enough along to do what you need.
Good luck.
jaquita