Where to Changing JM TUBE text

Hello,

I’m looking for the place where I can change the text ‘JM TUBE’ to my text:

< h 1 i d = " l o g o " > < a h r e f = " h t t p : / / w w w . m i j n b u x u s . n l / ? S I D = 8 4 d 3 8 6 3 8 2 d a b d 6 9 e f 9 d 1 8 5 7 b d d 8 a 4 b 3 6 " > J M T U B E < / a > < / h 1 >

For more info visit my buxus page. Only in de source code you can find my problem like above.

Please help thanks in advance