Laptop boots directly to ubuntu , cant access BIOS or Boot menu anymore

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Im running Laptop with single OS; UbuntuMATE 15.04 Beta1 64bit on Toshiba laptop Core i3. after burning "Elementary OS" on a live USB drive using UNetbootin, what happened is:

-after reboot, laptop directly shows UbuntuMATE boot screen, doesnt show Toshiba logo at the begginning as usual. so no access to BIOS or boot menu anymore.so it boots directly to UbuntuMATE and it runs normally.

-installed Boot-Repair and ran (Recommended Repair) it gets aborted showing me this msg (Please use this software in a live-session (live-CD or live-USB). This will enable this feature) ... which i cant boot from a live CD or USB as i lost access to boot menu.

-boot info summary gave me this link http://ift.tt/1HvLnM2 which i can ask for help providing information in it.

-i looked around into several posts but couldnt find what matches my case.

what exactly am i supposed to do? im a little new to Linux (3 months) and im still learning, so i do not know much.