The MBrealtime.txt and MBrealtimegauges.txt are both updated by the conds.php script that you have Meteobridge run as an HTTP access to your website.
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You edit the MBrealtime-template.txt file (included with the MB-plugin.zip) and replace 'your.website.com' with your full website address and save the file. Select the contents which should look like http://your.website.com/conds.php?d=[DD]/[MM]/[YYYY],[hh]:[mm]:[ss],[th0temp-act],[th0hum-act.0],[th0dew-act],[wind0avgwind-act],[wind0wind-act],[wind0dir-act],[rain0rate-act],[rain0total-daysum],[thb0seapress-act],[wind0dir-act],[wind0wind-act=bft.0],m/s,C,hPa,mm,--,[thb0seapress-val60:--],[rain0total-monthsum],[rain0total-yearsum],[rain0total-ydaysum],[thb0temp-act],[thb0hum-act],[wind0chill-act],[th0temp-val60:--],[th0temp-dmax],[th0temp-dmaxtime],[th0temp-dmin],[th0temp-dmintime],[wind0avgwind-dmax],[wind0avgwind-dmaxtime],[wind0wind-dmax],[wind0wind-dmaxtime],[thb0seapress-dmax],[thb0seapress-dmaxtime],[thb0seapress-dmin],[thb0seapress-dmintime],[mbsystem-swversion:--],[mbsystem-buildnum:--],[wind0wind-max10],--,--,[uv0index-act:--],--,[sol0rad-act:--],[wind0dir-avg10:--],[rain0total-sum60],--,[mbsystem-daynightflag:--],--,[wind0dir-avg10:--],--,m,--,[mbsystem-daylength:--],--,--,[uv0index-dmax:--]
as one long string and copy it to the clipboard.
Open the Meteobridge Server TAB with the entry for HTTP access that's set for every 10 seconds.
Click on the URL textbox, right-click and Select All, then right click and Paste your copied contents into the URL: textbox replacing ALL that content. Then press the Test button and it should show success.