Rotate the view by holding Ctrl and while the cursor is in the 3d View and dragging the cursor up until you can see the bottom of the cylinder.

Now select just one of the edges going down the side of the cylinder and again use the 'Edge Specials' menu to mark another seem. The top ring of edges should now have an orange color to them indicating a seem. After selecting the edges, hold Ctrl and press E to bring up the 'Edge Specials' menu and click 'Mark Seem' with the. Now, while holding Alt, press the to select a 'ring' of edges going around the top of the model. Make sure nothing is already selected by again pressing A, then position the cursor so it lies near the center of one of the edges going around the top of the model. To select the first seem we will be using what is know as 'Edge Loop Section'.

Change to 'Edge Select Mode' by holding Ctrl and pressing Tab ⇆, when the 'Select Mode' menu pops up, release Ctrl and Tab ⇆, then click on 'Edges' with the. Move the cursor back into the 3D view and if you're not still in mesh edit mode for the cylinder, reactivate it by select the cylinder and pressing Tab ⇆. To fix this we need to 'mark seems' on the model. This is because Blender doesn't know where to separate the texture. Now we could select all the cylinder's faces and pressing U to unwrap the model right now, but if we do we might get odd looking UVs.

Blender modeling