Give up? Are you saying that you don't understand what I wrote? If so, then simply ask your questions.
There are some basics you do need to know, though. I suggest you save this post and refer back to it if you have questions. You can also ask for clarification if you want.
Everything around you is made of atoms. Those atoms are made of protons, neutrons, and electrons. The protons and neutrons are in the nucleus of the atom (at the center), which is much smaller than the atom. Usually (but not always), the number of electrons and the number of protons is the same. This is what determines the chemical properties of the atom. Atoms with the same number of protons are said to be the same element. For example, an atom of carbon has 6 protons in its nucleus, an oxygen atom has 8, and a uranium atom has 92.
Atoms can share electrons, though, which is what makes a chemical bond. Atoms bound together in this way form a molecule.
Radioactivity occurs when the nucleus is unstable. Either there are too many protons or too many neutrons for it to be stable. When this happens, there is a 'decay': either an alpha decay, where two protons and two neutrons are emitted (since a helium nucleus is made of two protons and twqo neutrons this make helium), changing the chemical nature of the atom to one that is two protons less. Or there can be a beta decay, where a neutron changes into a proton and an electron. This increases the number of protons in the nucleus by one. It is also possible for a proton to change into a neutron and a positron, thereby decreasing the proton number by one.
Different isotopes of an element are where the number of neutrons are different. For example, carbon 12 has 6 protons and 6 neutrons, while carbon 14 has 6 protons and 8 neutrons. For uranium, the U-238 isotope has 92 protons and 146 neutrons, while the U-235 isotope has 92 protons and 143 neutrons.
So, for example, Uranium 238 is radioactive and decays by alpha decay. So, after the decay it has 90 protons and 144 neutrons (two protons and 4 neutrons were emitted). This is an atom of thorium-234. it turns out that this isotope is also radioactive, so it decays further. Ultimately, the atom continues to decay until it gets to the place where it has 82 protons and 126 neutrons, which is an atom of lead-208.
Different isotopes take a different amount of time to decay. Carbon-14, for example, decays by half over a period of 5700 years. For Uranium-238, the half life is 5 billion years.
So, I want to ask: does this make sense? Do you have any questions about *this* material? is there anything you don't understand about it?