Go to imgur.com and press the tiny cloud symbol in the top right hand corner. If you encounter ads just X out of them. Tap the black circle above the "upload from device" text. Then choose a picture from your photo gallery to use and tap upload. You will see a drop down box with a green arrow next to it. Press the drop down box and choose BBCode and copy the link next to the drop down box. Come back to forums and go on the specific thread which you'd like to post the picture in and paste the code. Lastly, replace [lMG] [/lMG] code with [lmgfit] [/lmgfit]. Should look something like this: